It's possible, and there are adaptors, however they tend to be marketed towards professionals that have memory testers for desktop DIMMs and want to test laptop SODIMs and as such are probably more expensive than simply buying the RAM for your desktop.
If somebody does come along with a link to a consumer orientated adapter at a price that makes it worthwhile then also consider if it will fit in the case without problems, as you'll basically end up with double height RAM chips.