You can run a long ethernet cable either inside or outside the house to reach your room. You can use MOCA to convert from coax to to ethernet and vice versa to run it to your room if a coax outlets exists in both, although the moca stuff is rather expensive right now and may require some technical tuning and the use of a filter to not interfere with tv signals from cable or satelite. Powerline adapters are designed to be on the same electrical circuit so unless one breaker turns off both outlets its possible this will not work reliably. though they are fairly cheap and you can of course try it.
Ethernet up to 100 meters [a little over 300 yards] is definitely the preferred method you just plug one end into the router port, and the other end either directly to your equipment; a wired switch, a wireless access point inside your room, or both a wired switch and an access point.
The other option is to pay for a second internet service and have that one run to your room either dsl or cable depending on what options area available to you and what outlets are usable in our room. This is a rather expensive monthly cost but can be done.