You can't derive a coderef to a method because it wouldn't have its invocant. So pass a subref that invokes the method:

#!/usr/bin/perl

use strict;
use warnings;

use threads;
use myTest;

my @threads;
foreach  ( 1..2 ) {
    print "launching job\n";
    my $test = myTest->new();
    push( @threads , threads->new( sub{ $test->myTestFunc } ));
}

foreach my $thread ( @threads ) {
    my @command_output = $thread->join ;
    print "job done\n";
}

__END__
c:\test>t-junk2.pl
launching job
launching job
doing job ...
doing job ...
job done
job done
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