Subject Alternative Names in SSL certificate after purchasing

Hi Team,

     We got a SSL for our website "www.mydomain.com". After installing the certificate with Apache, we found that the browsers are reporting that the certificate is only valid for "www.mydomain.com" and not to "mydomain.com". We can't redirect non www to www in this site. While checking the old certificate, it was having "Subject Alternative Names:" as both "www.mydomain.com" and "mydomain.com". In new certificate, only www part is preasant.

Can the "Subject Alternative Names:" can be edited in new certificate? 

Regards,

S.Senthilvel.