In order to leverage host header capabilities with SSL enabled sites you need to use a command line tool as the IIS GUI management tool does not allow you to bind multiple SSL sites to the same IP.
The ‘appcmd’ executable is in the following path %windir%\system32\inetsrv
The syntax is:
appcmd set site /site.name:"Site Name" /+bindings.[protocol='https',bindingInformation='*:443:site.name.com']