Yeah there are several I have ran into, one close to the town I am holding up in.
2399S 2376W to 1282S 3270W
122S 1853W - small desert with two caves.
110S 2135E - is part of the town there, also a snow biome as part of the town so plenty of water close by.
2637N 2271E - not desert but a sandy beach, large body of water, its just east of the town there.
Most of the area I have explored is in the south, lots of plains, burnt land, and forest area. I usually head to the third one I listed and dig sand from that desert, water close by, buildings to loot, forest for trees, started a mine right next to the edge of town. Key thing to remember is the top most layer gives you the most sand, the lower levels give you less, but if you have a good auger you can blow through it pretty fast after you've cleared the wandering z's in the area.