3ds Max software doesn't seem to have default support for exporting of SketchUp graphics (.skp), but you can probably find plugins that add this function to the program. If you do not have access to 3ds Max, you will probably need some 3rd party alternative
Convert 3ds Max (3D Studio MAX) scene to SketchUp graphics.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert max to skp on Windows
A 3D CAD translation softwate
Convert from max file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.