you cannot upload a sitemap to google blogger or google webmaster tool? to submit your sitemap, you login to your google webmaster tool and submit form there
You can also ping Google and other Search Engines. As long as you have a sitemap easily accessible and added to your Meta tags. Most Search Engines like Google and Yahoo! will easily find your sitemap and index all of your pages after a few hours, a day or 2 at most.
Proceed to Google Webmaster tool and just add the URL of your site. Google will make the sitemap for you.