We have visited their hotel several times, but I'm not sure if the pools are for day use by non-hotel guests. You might want to check that out directly with the hotel. They do have a public access to their beach however. You might want to consider wandering up the road a bit to the Royal Waikaloan - they aren't as restrictive with their pools, although you will have to provide your own towels at the pool and other faciilties.
Have a great visit!