As with any of the hotels along Groveland's main street (Highway 120), directions are largely superfluous. If you're driving towards Yosemite on Highway 120, the Groveland Motel will be on your right just before you leave town. Finding it will not be a problem.
For a larger-scale map showing where Groveland is in relation to Yosemite, see the Yosemite Lodging main page.