I'm guessing you want to stream video through your blueray player. Depending on your wireless setup/house configuration, you may not get enough reliable bandwidth with wireless.
If that doesn't work, there are 2 wired ways -
1) A long Ethernet cable/adding Ethernet cable in the wall that KeepOnTruckin recommended. Definitely works, but depending on your house, installing it can be a pain.
2) Using home wiring with HomePlug AV adapters.
http://www.homeplug.org/home/
HomePlug has several throughput standards, the newest/fastest is 500. Whether HomePlug AV works/works well depends on the age of your house & its wiring configuration. There are a number of vendors. We use NetGear's 200 adapters & 4 port switches & they work well for us, but we're not streaming a lot of streams. My brother-in-law is in an apartment building & replaced his unreliable wireless & wires running everywhere with them & they work for him too.
http://www.netgear.com/home/products/powerline-and-coax/work-and-play/default.aspx
Their 500 adapters are new. if you want to connect more streams and if you can find them, I would get these instead of the 200s.
http://www.netgear.com/home/products/powerline-and-coax/high-performance/default.aspx