When I search on Google by my website main keyword, I got the result with 4 sitelinks. But I don't want the one of them to show on the result, and I don't want to add this site to Google webmaster tools. Is there a way to remove this page from sitelinks without Webmaster tools? If I add Robot NOFOLLOW to that page, will it low down my SEO?
Hey if you using wordpress means, just install wordpress nofollow plugin, so you can add those page which you dont want in google search results.
According to my knowledge, Without website tool it is not possible to remove site link because Google automatically create site link based on popularity of that page and Number of search for that page.
If it is indexed by Search engine then its solely depend upon the SE when they will remove it from search result unless we guide them via webmaster tool.