i dont think it exists. have you thought about creating your own sitemap file and uploading to sites.google.com??? still, i doubt you can do this.hi
the sites in the google site system sites.google.com/view/ has any feed or sitemap?
There's no option to make a sitemap on google sites,
yet, it's not really required as all of the website's pages are actually interlinked from the main menu, so you shouldn't really care/worry about crawling for it,
Google will simply detect all these internal links just by crawling any of the pages
Same is my casethe problem is it took 2 week to index just one of pages and rest of pages yet not indexed in google