Sandworms are large snake-like monsters and one of them appeared as a major villain in the 1988 live-action movie Beetlejuice. They are a type of creature that lives on Titan, a dusty moon for Saturn. At the end of the film, It eats Beetlejuice.
While they don't speak, there is a interesting cartoonish reaction when one is hit. Seems as through they have the personality like a dog.
Sandworms live in sand all their lives. Nothing more.
There are real sandworms, but they are nothing like their movie and cartoon counterparts.