There are two ways to do that. One involves pulling the fuse for those lights. I believe its #5 or #7, not sure because I don't ahve a TJ (maybe a TJ owner has the right fuse number). The second is what I did in my YJ. I installed a set of quick disconnect connectors inline into the wires leading to the door switch. It took about 30 each wire them and I just leave them disconneccted unless I feel the need to have interior lights.
TARSI