I'm not sure what you want to bring from where to where.
If you want to have your SketchUp model in Keynote, you have to export it. In the menu File → Export you find two options: for "3D Model", choose a file type (*.dae/*.kmz ...) that Keynote can import or search on the internet for a converter that can convert one of the formats into a format that Keynote can import. If there is none, you can still export as "2D Graphic" and use the jpg or png image.
If you want to bring something from Keynote into SketchUp, you have to export it from Keynote into a format that SketchUp can import and then open SketchUp and click in the menu File → Import.