Submitting your sitemap to Google is a great way to let Google know you've just made some updates to your site and you want their "crawlers" to take a look at your new information. You don't need to resubmit a sitemap every time you change something, but it is good practice to submit your sitemap anytime you've made any major changes to your website.
Follow the steps below to learn how to submit your sitemap to Google using Google Webmaster Tools.
STEP 1: VERIFY YOUR DOMAIN
First, you need to verify your website with Webmaster Tools if you haven't already. To do so, log in to google.com/webmasters and click on ADD A PROPERTY and enter your domain name.