A protein complex that contains a protein kinase (Sid2 in S. pombe) and its regulatory subunit (Mob1). The Sid2p-Mob1p kinase complex is a component of the septation initiation network in fission yeast (called the mitotic exit network in S. cerevisiae) and is required for cytokinesis. The analogous complex in S. cerevisiae is called Dbf2p-Mob1p complex.