Does sitemap help in SEO?

Of course, a good formatted sitemap would help you more indexed and quick indexed by SEs, thus help your in onpage SEO.

definitely sitemap will help you and it will indexed your site

Timo, use the webmaster tools to submit and check your various sitemap(.xml) files.

Offcourse, sitemap is veryful in SEO.
if your sitemap is well formatted then its easy for google to rank your site in search engine,

Site map is the most important route towards achieving optimized site. Site map enables search engines know about your website by the site map. A sound skilled site map helps your users to steer easily within your website.

Yes, it would help in indexing. It informs the search engine about your site by adding the sitemap.

site map is very important

site map is good feature of a site. I think it will add organic and real business opportunities. This adds more human connection as your visitors my visit your store or business.

You are strongly recommended to have a site map on your site. First of all, it will help your visitors and, which is more important, it will help you get higher position in Google ranking.