The only safe answer is to say, "Level the ground under the pool, before refilling". And, not with sand, which tends to wash away from splash out or rains.
It's not impossible that what you are trying to do will work, but I wouldn't bet on it, myself. It's hard to tell, without actually seeing what you are doing, how much you are stressing the pool.
I guess the bottom line is, if you can afford the risk that you'll destroy the pool, and don't care to do the work needed to level the pool . . . go for it. It *might* work.
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