Pompierre was the best beach of Les Saintes islet (Les Saintes) in Guadeloupe, but it was damaged by the hurricane. There are a lot of algae ashore, but occasional cleanups help with it. The problem of algae is usually typical from June to October, - when it smells, and swimming is dangerous. But even now, it is a nice wild spot with grazing goats, located in a sheltered bay with calm water. Shore and seabed: sand. 
Fly to Guadeloupe international airport (PTP). Next take a ferry to Les Saintes islet. Ferries depart from different piers of the main island - including Basse-Terre and Pointe-A-Pitre. When get to Les Saintes, you may easy walk to any beach.