Yes, Cala S'Almunia's official website is www.platgesdebalears.com/caplaibFront/playa_basico.it.jsp?cPla=65016&cMun=1&cIsl=MA. You'll find the direct link in the "Website" section of this listing.
On this listing you can see "Other beaches nearby" right below, sorted by proximity. You can also open the full beaches page for the complete map ranked by distance from your location.