You could change them in System Preferences/Keyboard/Keyboard Tab/ click “Modifier Keys” but I agree with Dave that it’s a bad idea.
Even if you mean to switch back and forward between Windows and Mac you’d be better learning both ways. Unless you only use SketchUp you’ll be forever having to translate shortcuts in your head for every other app. Command C and control C for the clipboard copy can’t be fixed by remapping keys for example.