What is a Sand Shark? Are they dangerous to humans? - QuoraMay 14, 2015 . Sand sharks a/k/a sand tiger, grey nurse and ragged tooth. Their name reportedly comes from their habit of hanging out near the shoreline,.what are sand sharks,What is a Sand Shark? (with picture) - wiseGEEKThe sand shark is a slow, bottom-dwelling shark known for its mouthful of long, sharp teeth. Sand sharks are considered gentle creatures, however, and.