When a Perl module is installed (via the Perl mantra "perl Makefile.PL; make; make test; make install") without additional parameters for customization, it ends up being installed with everything else available to any user of the Perl interpreter itself. (But site modules are kept separate from core/builtin modules yet.)

To install modules, it is usual to employ the same user that did the installation of the interpreter. That is why it is common to have this variation of the commands:

$ perl Makefile.PL
$ make
$ make test
$ sudo make install # after everything looks ok, 
              # get the appropriate privileges and install
[download]

This or any more well-behaved routine with special users and tailored permissions to improve security will work smoothly in general.

Other alternative is to set the environment variable PERL5LIB with the additional paths where your modules are installed and to make it visible to every user you care for. But this will be harder to maintain, but yet feasible.

Read more in perlrun, section ENVIRONMENT.