8145 W. Wandering Spring Way is under contract. It is still in the inspection period, so it may come back on the market within a week or two. To answer your question in general, many listing agent provide a floor plan as part of the listing. If the owner or builder does not have one, there are several companies in town that will create a floor plan at a very reasonable cost.
You as a buyer could have one done if you had a contract on the house, if you were willing to pay for it.
Owner/Broker Blackhawk Realty
As Spirit and David have mentioned, this property is under contract, but I was able to locate the floor plan for you (along with the rest of the Sunflower models)l. There were several options available when they were built, so there can be some variations, but this is the basic one for the Sierra 1296 sq. ft. I've posted it on my Facebook page for you...click on web reference below.
Are you pre-approved with a lender? If not, that needs to be your first step. Next, find a local Realtor to help you find properties that are available (unlike this one). Local agents took the time to answer your questions, give one a call like David Hopper below. Best of luck.