Try removing the escapes (escapes are not needed in url):
RewriteRule ^sample-page$ “http\:\/\/google\.com” [R=301,L]
to this (all you need is the exact URL that you’re directing them to) (there is a difference between external and internal redirects, so I’m not sure what you’re exactly trying to do):
RewriteRule .* https://google.com/ [L]
So try this:
RewriteCond %{REQUEST_URI} ^https://www.bestsponsors.info/sample-page/$ [NC]
RewriteRule .* https://google.com/ [NC,L]
or
RewriteCond %{THE_REQUEST} ^https://www.bestsponsors.info/sample-page/$ [NC]
RewriteRule .* https://google.com/ [NC,L]
Remove the $ symbol if you don’t want to be that specific, for exmaple if you’re wanting to including sub-directories, etc that need to be redirected as well.