Yes, sod is a Scrabble word!
...and is worth 4 points in Scrabble, and 4 points in Words with Friends
sod
Verb
1. Cover with sod
Noun
1. Surface layer of ground containing a mat of grass and grass roots
2. An enzyme that catalyzes the conversion of superoxide into hydrogen peroxide and oxygen
3. Someone who engages in anal copulation (especially a male who engages in anal copulation with another male)
4. An informal British term for a youth or man
What Scrabble words can I make with the letters in sod?
3 Letter Words
2 Letter Words