You can create sitemap for blogspot blogs with the help of Labnol Sitemap Generator.You can create xml sitemap for selfhosted blogger blogs and blogspot blog that ends with blogspot.com(Techgide.blogspot.com)
To create xml sitemap follow these steps
1)Open Sitemap Generator and type the full address of your blog including http://
2)Click the generate sitemap button.As soon as you click the button sitemap generation process starts.It takes few seconds to create sitemap for your blog.After the sitemap is created just copy total text generated to your clipboard.
3)Next go to blogger Dashboard.Under the settings go to search preferences and enable custom robots.txt option.Now paste the text generated above in the box and save the changes.
Thats it.Now you have successfully created sitemap.Google will now crawl and index your blog using robots.txt file.