Off the west coast of Anguilla and southeast of Prickly Pear Cays, the snorkeling at Sandy Island is renowned for clear waters. The acccess to Sandy Island is only via a free shuttle boat every 30 minutes from Sandy Ground Beach next to Johnnos Bar.
To reach the snorkeling on Anguilla, you will need to fly into St Maarten and then take a small connecting plane to Anguilla via Anguilla Air Services. If small plane bother you, there is a regular ferry between the islands from Marigot ferry port on St Maarten to Blowing Point Ferry Terminal on Anguilla. In either case, there is a $20 USD departure tax per person. In case you are just interested in snorkeling off Anguilla, but don’t necessarily need to stay on island, there are several snorkeling tour companies on St Maarten that run multi-island snorkel boat charter tours over to Anguilla, such as Capatin Alan’s Boat Charter and EcoSnorkeling.
Overall, Sandy Island is the 10th most popular snorkel dive spot of all 10 snorkeling dives in Anguilla.