If you are using a linux box this is one way..

Go to search.cpan.org and find your modules, to the upper right of the documentation page for a module ( for example RDF::Redland::Storage You can download the distribution package, usually a "tarball" this is a zip like file with the files you need to install the module.

Save those for whatever you need.. then take them to your computer of choice. And follow the README instructions- which will likely tell you to run 'make', 'make test', 'make install' - as root user- from the directory you unpacked your files into (unzipped files to)

That was a brief 5 cent breakdown. That said- In my humble opinion- I would discourage this! It could become a nightmare. The modules quite often need modules that are not already installed. So.. if You install a::b, it is likely you also need b::c, but how do you know if you already have it? I suggest you plug your machine temporarily into the net, run cpan which will will also take care of dependencies.

Would you explain further what your situation is? Is this a laptop without wireless? There are solutions for this.