A search for the production of supersymmetric particles decaying into final states with jets (b-tagged or not), missing transverse momentum and two isolated leptons, e or mu, of the same sign is presented. The analysis uses a data sample collected during 2012, which corresponds to a total integrated luminosity of 21 fb-1 of sqrt{s}= 8 TeV proton-proton collisions recorded with the ATLAS detector at the Large Hadron Collider.