Sorry my diagram got screwed up.
I will try to describe how I think it should be done.
Main line to a valve to a tee. On the left side of the tee place a valve followed by the booster pump followed by a tee to back flow preventer to sprinkler system. Now go back to the original main line tee. On the right side run pipe up to the point of the tee that comes after the pump. Now place another tee here. Connect the 2 lines here including another valve at this location. Now on the right side downstream of the last tee put a valve then connect to house.
I wish I could draw this for you. If you want me to email you let me know and maybe I could draw a diagram that way. Also note that in my written diagram I did not include elbows a master valve, if you are going to have one, also some of these valves I would have electronic and some ball-cock type and I did not specify that either. Also dont for get drains if needed.
Thanks,
Pete