Networkless systems

My client is using Strawberry Perl on a machine that does not have
direct connection to the Internet. They had to install 2 additional
modules from CPAN. I told them to copy the tar.gz files to the target
machine and then run

 pip Module-Name-1.00.tar.gz

Unfortunately pip immediately wanted to connect to the Internet -
apparently downloading the index files of CPAN.
I solved that by telling them to untar the files and then do the
manual installations but I wonder if I had other, simpler option?

It would be nice if I could easily install additional modules without
network access.

regards
    Gabor