if you have that much sand in the tank, there is a very good possibility she buried the eggs somewhere. To find them you will have to sift through all the sand till you find teh eggs. Don't leave them in the tank to incubate as they will dry out. For incubation, you need vermiculite moisted with water till it clumps and feels damp but no water squeezes out. There are many kinds of incubators available and for small clutches y9ou can make your own. Most use small styrofoam coolers with heat tape, or an aquarium heater in water. The temp has to be something like 86F but I am not 100% positive on that. If she has laid her eggs and you don't have anything ready, there is a good chance the eggs won't be saved, but I would give it a shot anyway. Make sure your female gets plenty of food and a nice soak to rehydrate her after all that work.
As another person mentioned, it is best to house the male and female separately to prevent too much stress on the female. She has done alot of work and needs a break form the male. Keep in mind that there is a good chance she will have another clutch of eggs in 2-4 weeks so get that incubator and a better egg laying box ready for that clutch. Research more on how to prepare for clutching and incubation.
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PHLdyPayne