If your organisation holds a sponsor licence and the Home Office finds that you have broken the law in relation to who is entitled to work in the UK, you could be at risk of having your sponsor licence revoked, and a 12-month cooling-off period imposed on any new applications.
This would mean that as an employer, you would no longer be able to Sponsor non-UK Skilled workers. You would also need to wait a minimum of 12 months before you would be permitted to apply for a sponsor licence again.