Since Maps Marker Pro v2.6 you can automatically add links to your KML maps to your XML sitemaps easily, as support for the popular plugin Google XML sitemaps has been added. Please see the release notes for more details.
I plan to integrate an automatic ping service for Geo sitemaps in one of the next version – till then you have to submit your geo sitemap manually to Google (Google account needed). Login on https://www.google.com/webmasters/tools/ On the Webmaster Tools home page, click the site you want or create a new one Under Site configuration, click Sitemaps. Click the Add/Test Sitemap button. In the text box, complete the path to your Sitemap, for example https://www.mapsmarker.com/wp-content/plugins/leaflet-maps-marker/leaflet-geositemap.php Click Submit Sitemap. For more details please see http://support.google.com/webmasters/bin/answer.py?hl=en&answer=183669&topic=8476&ctx=topic.