How can i register my car i have a loan on to my sister out of state?

I am a MA resident, but will be moving to NH in a couple weeks. Where I am moving I will be car pooling and wont need my car. My sister, however, is currently without a car and wants to borrow mine. My problem is I currently have a loan out on the car. I know I cant have a registered NH car in a MA driveway, so how would I go about handling this? I cant seem to get a straight answer out of the RMV or insurance co.