In that case, your best bet is going to be something like what Capt_TopGun mentioned below. It needs to be a transmitter to be able to push the audio over bluetooth.

I don't have any personal experience with these devices so unfortunately I can't make a good recommendation but to point you in the right direction, this one has good reviews and is both a transmitter and receiver. Ideally, you could have it constantly plugged into power so it doesn't die on you.

Also, for any of these devices, you want to check to make sure your TV has a headphones port, an AUX out port, or RCA. If it only has RCA, you need to make sure whichever one you buy comes with a 3.5mm-RCA adapter (the one I linked to above comes with one), otherwise you will want to buy one seperately.