This is usually accomplished by adding cables to split the TV' audio to a sound system and to your headphones. Any decent store can tell you how to set this up.
I am 85 and hard of hearing I need a TV that allows me to have control of my audio and a separate control for the speakers.
Please list some models that fit the bill

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic