I have found that hooking up a sump pump to the vacuum hose itself not only drains it but it does so pretty quickly. We do this every spring. You may just need to keep an occasional eye on any leaves in the cover so not to clog the pump.
Additionally, your filter may be of help too. If your sand filter has a backwash valve, turn the pump off, rotate the valve to "waste" check for any other added valves down stream of the waste pipe and then turn on the pool pump. Be sure not to lower the water more than two thirds down on the skimmer throat. If you do the pump will suck air and stop pumping.
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To remove excess rain water in an inground pool, you likely want to get a filter. You can also install a drain at the very bottom of the pool, but this will need to be closed if there were water in the pool for swimming.