easy way:
use the /net directory to access the remote nfs-shares.... (already configured automountd)

otherwise you could mount it with your /etc/vfstab at boot time, but be carefull with the mount options.... false set false boot.... only mount when the remote drive is responding otherwise solaris should try it later, sorry i not sure about the right syntax but i've got another tip:
man mount (!)
:-)

greetings Preßy