This document explains how to get data from a Look into a Google Sheet, by using scheduled webhooks with Zapier. This article assumes you have some familiarity with Zapier. Please refer to Scheduling Looks and Dashboards Using Webhooks if you have not used Looker with Zapier before.
Note that overwriting your Google Sheet is optional. If you edit your Sheet, you likely do not want to overwrite it, but instead create a new version each time.