Believe it or not, your question is pretty generic...for example, your sewing machine set up may be in a small cabinet or a large built-in desk...ironing board or ironing station? Not all sewing rooms are created equal...especially if you are including a laundry room?
I am in the midst of doing a build out over a two car garage and have done a ton of googling of dream sewing studios, but I have not seen any professional planners...how about graph paper?