Instructions. Open SketchUp. Go to the Tool panel, and select the Circle tool. Draw a circle on the ground that is the overall diameter you want your spiral to be.Select the Line tool (the pencil) and use it to draw through the center point to the other side, dividing the spiral into sections across its diameter.nstructions. Open SketchUp. Go to the Tool panel, and select the Circle tool. Draw a circle on the ground that is the overall diameter you want your spiral to be.