Larry Safady IS The Sandman.
If you saw this Heart sculpture the Vow Renewal ceremony at Trunk Bay on valentine's Day, you saw his work. (Photo courtesy of TropicalFocus.com)
That's his art, honed by instruction at California State University at Long Beach, years before he made the move to St. John.
In a profile of Safady, the St. John Source says he migrated to St. John after a career as an art director for Disney and 20th Century Fox and Mattel. Now he hires himself out for $35/hour to do works of sand at parties, weddings, grand openings opr whatever, says the Source.
Building a sand castle or house or corporate logo is more than just piling grains of sand. There are buckets of water to be carried, too, to help compact and shape the creation.
You can see other examples of Safady's work on the Web. Flickr has some shots of a complicated sculpture of a man pulling a child from the rubble of the Haiti earthquake, a project he did as part of a fund raiser.