Sandy Ground, Saint Martin offers 10 beaches perfect for sunbathing, surfing, swimming, and more. Sandy Ground, Saint Martin, is known for its vibrant nightlife at Le Sand Beach Bar and its proximity to the famous Marigot Market. The best time to travel to Sandy Ground, Saint Martin, is from December to April, with average air temperatures around 77-82°F (25-28°C) and water temperatures about 79-82°F (26-28°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!