Multisite Redirect for Home Page Only

You can detect if you’re on the front page of a given site with is_front_page(). You can use the init hook to do a wp_redirect() to any absolute URI you want.

add_action( 'init', 'wpse182623_redirect_home_page_only' );
function wpse182623_redirect_home_page_only() {
    if( is_front_page() ) {
        wp_redirect( 'http://example.com/some-other-page/' );
        exit;
    }
}

Put this into a plugin and activate that plugin on any sites where you need the front page to redirect elsewhere.

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Reference

• is_front_page()
• init hook
• wp_redirect()
• Writing a Plugin