For the love of god tell me you're not an air traffic controller :P

Anyway unless you are an administrator for the router or want to try to install another router in between your computer and the router you want to hide from, there will be nothing you can do to hide. Best bet is to just work at work, and play at home if you are worried about getting caught. Afterall they pay you to be there, they can restrict the fun you have while they are paying for your time.