Do I need a surround system connected to a blu-ray player for surround sound?

I am getting a blu-ray player and a HDtv and I was wondering do I need my home theatre system connected to the blu-ray player to get full surround sound? I’ve heard the blu-ray player can put out 5.1 surround sound in it to tv. But I want the sound to go all over my room with me in the centre of it, to feel like I’m in the movie.