xD VAC Woops

As you can see by the title i was recently banned VAC wise off of CSGO, I am quite new to VAC bans and how they work. So the question is, will i be able to play Garrysmod still or no>

Yes, Garry uses his own private banning system so you’ll be fine.

VAC bans only ban you off the game you CHEATED on.
Some games have there own Anti Cheat such as Gmod.

Long story short you shall only get banned on the game you cheated on.