Home network help

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Live in US, multiple story house built about 12 years ago. Kind of in the middle of nowhere, so there was no cable internet/tv service available originally. Had to go satellite; HughesNet for internet, and DirecTV for tv.

The house was wired with coaxial cable in most rooms, and that's what we used for tv boxes. I believe internet was added later, but my ISP wired it so the modem would only work in one room (there was already a coaxial cable in that room, but they added a second that leads to the satellite outside). At least, this is my understanding of it. I always thought that internet and tv ran over different cables. I've tried plugging my modem into other coaxial ports around the house, but it doesn't work.

I have cable internet now (Metrocast), and still have DirecTV, but we're thinking of dropping it soon. Is there someway for me to move my modem to other ports in my room, or do I have to pay my ISP to do it? Right now I just have a powerline adapter to get wired internet in other rooms, but I'd really like to just move the modem.