Large I.D. vinyl hose. Start a siphon and use the hose to vacuum up the crused coral. Treat it as a water change. Do about 5 gallons of water at a time. Wait about 4 days and do it again. Do this until all the crushed coral is out. Then like shorty said make sure you rinse the new sand well, put it in the tank in either of two ways.
Use a pc. of PVC pipe and pour the sand down the pipe to the area that you want it to go to.
Use a ziplock bag. Fill the bag with the sand, put the bag in the water on the bottom, open it and move the sand out slowly.
Either way your tank will get some cloudiness but run your filters and it should take care of it in a short time.