The Pro version SketchUp allows users both import and export of DXF graphics, so there should be no problem here and you can transform .dxf files to produce .skp files (SketchUp graphics). However, if you do not have access the the commercial version of the program, you have to use some 3rd party alternatives or even some dedicated 3D/CAD converters.
Open DXF file Open SKP fileA 3D CAD translation software