I agree with Carol. I would wait until March 1st to see what is formally announced as the entry requirement to Sint Maarten.
As far as a rapid antigen test if you need it to enter Sint Maarten from Canada the tests you receive from the local pharmacies here in Ontario are good. For example, back in October, I used Shoppers Drug Mart. Others have used Walmart. I have recommended Shoppers Drug Mart and several have used them. You probably know but you just have to book the test ahead of time.
The rapid antigen test that you get back at Shoppers Drug Mart is given to you in about 15 minutes while you wait.

Just keep monitoring to make certain of the rules because they can change quite quickly. I have been to Sint Maarten from Canada three times in the last 3 months and the rules have changed each time.

DrPhilSXM