It has been asked before and unfortunately, it is a difficult ask. While the internal format for the DOS music has been figured out (and actually is very MOD-like), the main issue is that the instrument sounds in the DOS music is synthesized very differently from MOD music. So you definitely cannot make it sound exactly the same in MOD, and regardless, it'll still take some work to properly sample the individual instrument sounds for MOD use.
That said, if someone does make an effort to make the DOS music available in MOD format some time in the far future, you'll probably hear about it here.