A sensor module for a sensor is provided that has a sensor unit having a detection direction and a detection height as well as a module housing having at least a first outer wall for arranging at a planar base surface, whereby then an orientation and a height position of the module housing and thus the detection direction and detection height of the sensor unit are fixed. In this respect, the first outer wall has a three-dimensional contour here that is adapted to the individual detection direction and/or detection height of the sensor unit and tolerances of the sensor unit in the detection direction and/or detection height is/are compensated by the three-dimensional contour on an arrangement of the first outer wall at a planar base surface.