Yes you can. Here is a caution.

For mulching • Coffee grounds are finely textured and easily compacted. • Compacted coffee grounds create a barrier to moisture and air movement, especially when applied in thick layers. • Therefore, I recommend against using pure coffee grounds as a mulch; instead, try using a thin layer (no more than half an inch) of coffee grounds and cover with a thicker (four inches) layer of coarse organic mulch like wood chips.

https://s3.wp.wsu.edu/uploads/sites/403/2015/03/coffee-grounds.pdf

Coffee grounds are excellent for compost, and this publication covers this as well.

Good luck.