If it's a 1.5 hp Above Ground pump it's probably OK. But if it's an In Ground pump it may well be too strong. That depends on whether it's an "up-rated" or "full-rated" pump. If it's full-rated, you may be able to get a replacement impeller that lowers the output from the pump.

It all comes down to the GPM the pump puts out, and the max GPM the filter can stand. The pump MUST be less than the filter.

Normally, I would suggest a pump no bigger than 1/2 hp for a pool that size. With that filter, a 1/2 hp would give you great filtering as the filter would be under capacity, and sand filters filter much better when they aren't at or near capacity.

HRSDennis may be able to give you better details if you can provide the pump brand and model # . I know the basics, he knows the details.