Making sense of social situations requires social cognitive skills, which can be impaired after acquired brain injury (ABI), yet few evidence-based treatment options are available. This study aimed to evaluate the feasibility of a multi-faceted social cognition group treatment programme, SIFT IT, for people after ABI using an RCT design. Twenty-eight participants were recruited, and 23 were randomized into either Treatment or Waitlist. SIFT IT consisted of 14 weekly 90-minute small group sessions facilitated by a Clinical Psychologist. Topics included: emotion self-awareness, emotion perception, perspective taking, and choosing adaptive social responses. Preliminary efficacy outcomes were assessed at baseline, post-treatment, and three-month follow-up. Demand for treatment was evident with 61% recruitment and 91% post-treatment retention rates, with 63% attending at least 13/14 sessions. Large between-group treatment effects (with non-zero 95% confidence intervals) were observed for emotion perception, detecting hints, and informant ratings of social cognitive deficits. Implementation challenges recruiting to groups and maintaining group allocation fidelity, with a small sample size does, however, raise questions about the appropriateness of an RCT design in a future efficacy trial. Overall, this study showed there is demand for social cognitive interventions after ABI and the SIFT IT programme was practicable and acceptable to participants.