A substructure (1) for an artificial lawn, comprising a top layer (4) of artificial grass fibers (5) and a substratum (2), which substratum comprises a number of individual layers, including a base layer (2), an intermediate layer (7) positioned on top of said base layer an a sand layer (3) positioned on top of said intermediate layer, wherein said sand layer comprises at least two sublayers, wherein the first sublayer (11) comprises a sand fraction having a particle size which is larger than the particle size of the sand fraction of the second sublayer (13).