Not that I've ever done it, but my guess is that someone skilled and handy enough could, with several helpers (or a bunch of wooden wedges and shims) re-level the pool. If I were doing it here, where we have limestone quarries all over, I'd be inclined to use limestone sand, rather than quartz sand -- it will stay in place better.
If you post pictures using Google+, you are more likely to get more helpful advice.
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