Since everyone here has covered indepth the "How To" I will take the other approach which will be much simpler.
Many, Many Library's today come with a multitude of different hand clap ssmples. Search out the net for free downloadable samples, look at your Libraries for Rapture, DimPro, Session Drummer and other synth Libraries from sonar.
What about any drum libraries you may have? have you checked them?
If you have any NI Products, check out them.
Loop Masters and Producer Loops have soo many Hip Hop / indie / etc libraries that include claps..
for that matter Computer Music Magazine's included DVD will usually always have hand claps in their monthly collection..
and this is just the start.....I am sure if you look hard enough you will be able to scratch some up with no problem...
And like they have suggested get several and layer, alternate, detune a bit, offset one here or there in the layer etc......
You get the idea.
Clifford