The Sand Worms are large worm-like beings. They have solid dark brown skin with thorns on it, especially around their mouths. Also, instead of a face, they have a wide red mouth with six flaps around it.
In Shadow the Hedgehog, the Sand Worms burrow underground and attack from beneath, using smaller worms that home in on their prey. According to Doom's Eye, the worms find their prey by detecting their target's vital signs. Like the Black Oaks, it takes from two to seven hits for their destruction depending on the weapon used to defeat them.