I had the same problem until I read a thread about this on Reef Central.
There are two main approaches.
One is the classic approach. Make a "T" where the pipe enters your sump. Part of the T points upwards, this is where the air escapes. The part of the T points downward, this is where the water goes. Sorry I don't know how to post pics.
The other approach is the one I went with, it is a silent overflow system, a guy named Herbie posted it on Reef Central about two months ago, works a lot better than the T system for me. Do a search for this on Reef Central. What it amounts to is a valve to cut back the flow in your pipe from the standpipe to the sump, and a second emergency overflow drain which is is place just in case the valved line gets blocked up. With the silent overflow system my tank is absolutely silent except for the pump noise.
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