There are plenty of ways how you can import pictures to SketchUp, you can use and import them as objects, use them for textures and probably plenty of more. You can download the basic version of SketchUp for free, but for more functions you would need the commercial version. Some other programs may also support SketchUp formats, but using the original is always better choice.
Convert Portable Network Graphic to SketchUp graphics.
We have found 4 software records in our database eligible for .png to .skp file format conversion.
Microsoft Windows software - convert png to skp on Windows
A 3D general-purpose modeling program
Convert from png 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 png 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
Apple macOS / Mac OS X software - convert png to skp on OS X
3D modeling application for Mac