Soundbars are designed to be "poor man receiver". They don't even come close to receivers in capabilities - they are designed for minimum wiring (if at all).
So, unless you get a soundbar with detachable speakers (which will be no longer a soundbar), and put speaker selector in between - get another receiver. Because the next thing you will ask is "how to connect my TV to my shiny new soundbar", "how to connect my Roku" etc etc