There aren't any public swimming pools in the Sacromonte.
There is a page with information about swimming pools here:
http://granadamap.com/sport/swimming.htmThese may be more for proper lane swimming.
There is an aqua park with waves and slides at Aqua Ola in Cenes de la Vega.
You will have to get a bus or a taxi.
Info here:
http://www.granadamap.com/aquaola/index.htm