Use Mod_Rewrite to Rewrite ROOT to Another Path

Copying my deleted response:

In htaccess of your documentroot simply:

RewriteEngine on
RewriteCond %{HTTP_HOST} =subdomain.example.com
RewriteRule ^$ /page

A correct redirect of the root path is simply :

RewriteEngine On
RewriteRule ^/$ /page [R]

to force this only on one subdomain (which should barely happen if your rewrite block is in a virtualhost definition) :

RewriteEngine on
RewriteCond %{HTTP_HOST} =subdomain.example.com
RewriteRule ^/$ /page [R]

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