Sandworm are enemies from The Legend of Zelda: Phantom Hourglass.
Sandworms dwell in sandy areas of Isle of Gust and Temple of Wind. They are creatures that are triggered by sound, moving quickly towards the source. Walking very slowly will keep them at bay, but if Link runs, they will come charging from underground towards him. If caught, rub the stylus on the screen quickly to shake free. Their one weakness are Bombs. Just toss one near them and it will gobble it up and soon explode. If Sandworms come charging towards Link, he can escape by running away from sandy areas or toss a bomb to distract them.