My tomatoes have "worms"

I wanted to pop on here real fast and let anyone that was wondering about the mystery worm that was attacking my tomato plants.  The Tomato Pinworm  he is not my friend.... really, they are caterpillars; worms live in soil...at least that is what my son tells me (just great now I have to find out about the whole worm caterpillar thing).  I better get some sleep.
Jeana