From Herald article.
"Visitors must have health insurance coverage and travel insurance covering COVID-19. "
Also stated that Test has to be taken 72 hrs prior to departure which helps with long layovers with connecting flights.
From the St Maarten EHAS website (
https://stmaartenehas.com/travel-requirements/):
“9. Travelers with end destination Sint Maarten are required to have
health insurance coverage. Additional travel insurance covering COVID-19 related expenses is strongly recommended.”