This is a Scene Subset containing a tileable 6 by 6 m sand square and a Geoshell dirt layer.
Load via Scene Subset.

It's tileable and quite resistant to pattern repeating. Basis is a simple plane with a displacement map. The shader is maybe a bit complicated, but it works quite nicely also in closeups.
Of course you can put it on any other geometry, but take care of the scale then. If you use a larger plane, you have to downscale the mapping accordingly.

You can easily reshape the plane, or use external geometry, to form small mounds and use them to break up a too monotonous area. Just leave the edge of the mound/shape at Y=0, push it a little down that the edges disappear below the basic plane.