You can find full details on this website:
  https://www.gov.uk/tier-1-entrepreneur/access-to-200000-investment-funds
The Rules are quite complex,so you cannot proceed without the assistance of an immigration lawyer.
[Below is a relevant section relating to the criteria that we can sponsor]
245D. Purpose of this route and meaning of business
- (a) This route is for migrants who wish to establish, join or take over one or more businesses in the UK.
 - (b) For the purpose of paragraphs 245D to 245DF and paragraphs 35 to 53 of Appendix A ‘business’ means an enterprise as:
    
- (i) a sole trader,
 - (ii) a partnership, or
 - (iii) a company registered in the UK.
 
   - (c) Where paragraphs 245D to 245DF and paragraphs 35 to 53 of 
Appendix A, refer to money remaining available to the applicant until 
such time as it is spent for the purposes of his business or businesses:
    
- (i) ‘Available’ means that the funds are:
        
- (1) in the applicant’s own possession,
 - (2) in the financial accounts of a UK incorporated business of which he is the director, or
 - (3) available from the third party or parties named in the
 application under the terms of the declaration(s) referred to in 
paragraph 41-SD(b) of Appendix A.
 
       - (ii) ‘Invested’ or ‘spent’ excludes spending on:
        
- (1) the applicant’s own remuneration,
 - (2) buying the business from a previous owner, where the 
money ultimately goes to that previous owner (irrespective of whether it
 is received or held directly or indirectly by that previous owner) 
rather than into the business being purchased (This applies regardless 
of whether the money is channelled through the business en route to the 
previous owner, for example by means of the applicant or business 
purchasing ‘goodwill’ or other assets which were previously part of the 
business.),
 - (3) investing in businesses, other than those which the applicant is running as self-employed or as a director, and
 - (4) any spending which is not directly for the purpose of establishing or running the applicant’s own business or businesses.
 
       
   
245DA. Entry to the UK
All 
migrants arriving in the UK and wishing to enter as a Tier 1 
(Entrepreneur) Migrant must have a valid entry clearance for entry under
 this route. If they do not have a valid entry clearance, entry will be 
refused.
245DB. Requirements for entry clearance
To
 qualify for entry clearance as a Tier 1 (Entrepreneur) Migrant, an 
applicant must meet the requirements listed below. If the applicant 
meets those requirements, entry clearance will be granted. If the 
applicant does not meet these requirements, the application will be 
refused.
- 
Requirements:
    
- (a)The applicant must not fall for refusal under the general grounds for refusal.
 - (b)The applicant must have a minimum of 75 points under paragraphs 35 to 53 of Appendix A.
 - (c)The applicant must have a minimum of 10 points under paragraph 1 to 15 of Appendix B.
 - (d)The applicant must have a minimum of 10 points under paragraph 1 to 2 ofAppendix C.
 - (e)An applicant who has, or was last granted, leave as a 
Student or a Postgraduate Doctor or Dentist, a Student Nurse, a Student 
Writing-Up a Thesis, a Student Re-Sitting an Examination or as a Tier 4 
Migrant and:
        
- (i)is currently being sponsored by a government or international scholarship agency, or
 - (ii)was being sponsored by a government or international 
scholarship agency, and that sponsorship came to an end 12 months ago or
 less, must provide the unconditional written consent of the sponsoring 
Government or agency to the application and must provide the specified 
documents as set out in paragraph 245A above, to show that this 
requirement has been met.
 
       
   
- (f) Where the applicant is being assessed under Table 4 of Appendix A, the Entry Clearance Officer must be satisfied that:
    
- (i) the applicant genuinely intends and is able to establish, 
take over or become a director of one or more businesses in the UK 
within the next six months;
 - (ii) the applicant genuinely intends to invest the money 
referred to in Table 4 of Appendix A in the business or businesses 
referred to in (i);
 - (iii) that the money referred to in Table 4 of Appendix A is 
genuinely available to the applicant, and will remain available to him 
until such time as it is spent for the purposes of his business or 
businesses; 
 - (iv) if the applicant is relying on one or more previous 
investments to score points, they have genuinely invested all or part of
 the investment funds required in Table 4 of Appendix A into one or more
 genuine businesses in the UK;. 
 - (v) that the applicant does not intend to take employment in the United Kingdom other than under the terms of paragraph 245DC.
 
   - (g) The applicant must provide a business plan, setting out his 
proposed business activities in the UK and how he expects to make his 
business succeed.
 - (h) In making the assessment in (f), the Entry Clearance Officer 
will assess the balance of probabilities. The Entry Clearance Officer 
may take into account the following factors:
    
- (i)the evidence the applicant has submitted;
 - (ii)the viability and credibility of the source of the money referred to in Table 4 of Appendix A;
 - (iii)the viability and credibility of the applicant’s business plans and market research into their chosen business sector;
 - (iv)the applicant’s previous educational and business experience (or lack thereof); 
 - (v) the applicant’s immigration history and previous activity in the UK; and
 - (vi)any other relevant information.
 
   - (i) Where the applicant has had entry clearance, leave to enter or
 leave to remain as a Tier 1 (Entrepreneur) Migrant, a Businessperson or
 an Innovator in the 12 months immediately before the date of 
application, and is being assessed under Table 5 of Appendix A, the 
Entry Clearance Officer must be satisfied that:
    
- (i) the applicant has established, taken over or become a 
director of one or more genuine businesses in the UK, and has genuinely 
operated that business or businesses while he had leave as a Tier 1 
(Entrepreneur) Migrant, a Businessperson or an Innovator; and
 - (ii) the applicant has genuinely invested the money referred 
to in Table 5 of Appendix A into one or more genuine businesses in the 
UK to be spent for the purpose of that business or businesses; and
 - (iii) the applicant genuinely intends to continue operating one or more businesses in the UK; and
 - (iv) the applicant does not intend to take employment in the United Kingdom other than under the terms of paragraph 245DE.
 
   - (j) In making the assessment in (i), the Entry Clearance Officer 
will assess the balance of probabilities. The Entry Clearance Officer 
may take into account the following factors:
    
- (i)	the evidence the applicant has submitted;
 - (ii) the viability and credibility of the source of the money referred to in Table 5 of Appendix A;
 - (iii) the credibility of the financial accounts of the business or businesses;
 - (iv) the credibility of the applicant’s business activity in 
the UK, including when he had leave as a Tier 1 (Entrepreneur) Migrant, a
 Businessperson or an Innovator;
 - (v) the credibility of the job creation for which the applicant is claiming points in Table 5 of Appendix A;
 - (vii) if the nature of the business requires mandatory 
accreditation, registration and/or insurance, whether that 
accreditation, registration and/or insurance has been obtained; and
 - (viii) any other relevant information.
 
   - (k) The Entry Clearance Officer reserves the right to request 
additional information and evidence to support the assessment in (f) or 
(i), and to refuse the application if the information or evidence is not
 provided. Any requested documents must be received by the Entry 
Clearance Officer at the address specified in the request within 28 
calendar days of the date of the request.
 - (l) If the Entry Clearance Officer is not satisfied with the 
genuineness of the application in relation to a points-scoring 
requirement in Appendix A, those points will not be awarded.
 - (m) The Entry Clearance Officer may decide not to carry out the 
assessment in (f) or (i) if the application already falls for refusal on
 other grounds, but reserves the right to carry out this assessment in 
any reconsideration of the decision.
 - (n) The applicant must, unless he provides a reasonable 
explanation, comply with any request made by the Entry Clearance Officer
 to attend for interview.
 - (o) The applicant must be at least 16 years old.
 - (p) Where the applicant is under 18 years of age, the application 
must be supported by the applicant’s parents or legal guardian or by one
 parent if that parent has sole legal responsibility for the child.
 - (q) Where the applicant is under 18 years of age, the applicant’s 
parents or legal guardian, or one parent if that parent has sole legal 
responsibility for the child, must confirm that they consent to the 
arrangements for the applicant’s care in the UK.