Ammophobia

Ammophobia or ammosophobia (from Greek ammos, "sand") is the fear of walking on sand. Sufferers would not go to beach, desert, and even stepping on the sand in the beachbox. The most common cause of ammophobia is getting sank in the quicksand, linking with syrtesophobia. The less common cause could be getting stabbed by sand particles when walking on it barefooted, or seeing the footprint imprinted on it made them anxious.