The Pro version SketchUp allows 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.
Convert AutoCAD DXF Drawing Exchange Format to SketchUp graphics.
We found 3 software records in the database related to .dxf to .skp file format conversion.
Microsoft Windows software - convert dxf to skp on Windows
A 3D general-purpose modeling program
Convert from dxf file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned dxf to skp. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A 3D CAD translation softwate
An application for the planning of spaces and furnishings