How do I get a business loan in Mauritius in real estate?

Without proof of income, you won't be able to get a loan. So if you're unemployed, that will be a big NO.

The only exception to the rule would be if you apply for a business loan but for this, you will need to have a business plan in place with projections of how much money you expect to make yearly/monthly. Your purpose for the loan does not fall under this I think unless you run a restaurant/bar along. You can always try speak to a bank's manager to understand exactly the requirements for a business loan.