Think you have to use mod_rewrite
RewriteCond %{THE_REQUEST} ^GET\ /\ HTTP
RewriteRule / http://www.sod.com/ [R=307]
This will also mean it doesn't redirect POST requests to the home page as well. Not sure if thats what you wanted. But figured it was as it could imply parameters, like the query string.
If you wanted to also redirect HEAD requests
RewriteCond %{THE_REQUEST} ^(GET|HEAD)\ /\ HTTP
RewriteRule / http://www.sod.com/ [R=307]
And if you didn't want to use THE_REQEST
then you can do it with two conditions
RewriteCond %{REQUEST_URI} =/
RewriteCond %{QUERY_STRING} =""
RewriteRule / http://www.sod.com/ [R=307]
Edit: RedirectMatch is not part of mod_rewrite. Its part of mod_alias, so completely independant of any rewrite conditions.