You could grep them out of the symbol table:
my @subs = grep { defined &{ $_ } } keys %Your::Package::;
Update: I probably should have also mentioned that if you're doing this from a different package, you'll need to prepend the package name to make sure you're checking for defined-ness in the right symbol table. E.g.
package Foo;
sub foo { }
sub bar { }
sub baz { }
package Bar;
my @subs = grep { defined &{ "Foo::$_" } } keys %Foo::;
print join "\n", @subs;
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