You can go a few different directions with this.
If your TV has fixed audio output, your best option is to buy a pair of RF wireless headphones. Several manufacturers make headphones like this, but my favorites of this kind are Sennheiser and Sony.
If your TV has variable audio output and you're able to turn the built-in speakers on and off, you can get a Bluetooth transmitter (or two, depending on the device capabilities) and any Bluetooth headphones of your choosing - earbuds, on-ear, and over-ear. You'll have lots of options for headphones themselves, but few companies actually make the transmitters. This is also the most expensive option.
Finally, if you don't want to go with a wireless solution and your TV has fixed audio output, you can get a headphone amp (or two) and either long RCA audio cables or long 3.5mm extension cables. Several options for cheap headphone amps are available, as are options for the extension cables.