How can I get him to move out!?

I dont want to just come out and say get out of here! He is living in my shed/mini house without mine or my husbands permission. Our landlord is my friend and she said he could live in there because the sheds are her property. Well we are handling that situation by talking to the landlord. We told her it wasnt ok but she isnt going to make him leave. So what can I do to make him want to move. Are there things we can do to make him so sick of us he wants to get out? I am already blasting rap music (which I hates, but I know he does too) into the night but not loud enough to bother the neighbors. Is there anything else like this that we can do. Oh I have spoken with this guy and he also said he wasnt leaving. If nothing else works we call the cops because he is staying in there illegally and everyone knows it. So any help that doesnt include telling him to leave would be great.