I assume what you mean is that you want to embed an existing audio track? (Versus a program to create and/or edit sound?).
Any editing app. such as Final Cut or Premiere will let you do this, as can After Effects.
But I'm sure there are many other simpler apps out there that will do it as well. Quicktime Pro may even let you do it, but you'll have nowhere near the level of control over the sound -- such as precise positioning in the timeline, audio effects etc., that you'll get with a more advanced application.
HTH.