http://yoursiteaddress.com/sitemap/xml
You can submit this URL to Google Webmaster Tools. Don't have a Google Webmaster Tools account? Go here to sign up and follow our instructions for verification.
Once you have done that, follow these steps to submit the sitemap:
1. Go to Google's Webmasters Page and log in with your Google Account.
2. Click on the optimization section and select Sitemaps.
3. Click on the Add/Test Sitemap button and enter "sitemap/xml" in the prompt.
4. Click on Submit Sitemap.
After you submit a Sitemap, it may take some time before Google processes it. Once it has been processed, it may then take a little more time before Google crawls and indexes the URLs it includes.