As the title says - who knows one (or two)? Seems like the only one with a pool is Nikki Beach, and their pool is pretty small.
Don't know what you're exactly looking for, but maybe it's an altnernative? It's not a "beach club", but "One Ibiza Suites" has a wonderful rooftop infinity pool with beach view (and excellent sangria de cava). Quote from 2018: for guests that are not lodged at the hotel, there is a charge of 50€ per person, 20€ of which can be used towards consumptions (food/drink).
We're OBeach-ing on the Wednesday - so just looking for vibes on the Friday afternoon before guests head back to the airport at 9ish.Wikiwoo? Would say O Beach but that might be too much