my $module_name = 'Foo';
eval "use $module_name;1;" or die "Couldn't use $module_name: $@";

##</code><code>##

#!/usr/bin/perl
use strict;
use warnings;
use Data::Dumper;

my $module = 'Foo';
my $module_path = "$module.pm";
$module_path =~ s|::|/|g;
require $module_path;

print Dumper $module->new;