my %HoH = (
    SUB1 => {
        Test1 => {
            value1   => "2300",
            value2   => "0.01",
        },
        Test2 => {
            value1   => "5000",
            value1     => "0.34",
        },
    },
    SUB2 => {
        Test1 => {
            value1   => "2800",
            value2   => "0.05",
        },
    },
);
for my $sub_key (sort {$HoH{$a}{Test1}{value1} <=> $HoH{$b}{Test1}{value1} }keys %HoH){
   print "$HoH{$sub_key}{Test1}{value1}\n";
}