Introduction: Social frailty, characterised by reduced social interactions and support, poses a significant threat to older carers because it undermines their access to external support and connections, leading to impaired caregiving ability and well-being. We aim to report on our experience co-designing a multicomponent intervention that empowers older carers to optimise use of social resources and health services. Method: Content analysis and deductive mapping were employed to identify evidence-based interventions to alleviate social frailty. This process involved four stages: 1) a review of the literature identified primary studies demonstrating effectiveness in improving any of the social frailty constructs. 2) interventions were prioritised based on study quality criteria and relevance to the Australian context; 3) the TIDieR framework was applied to all interventions to enable replicability; and 4) the selected interventions were mapped to the COM-B framework, the Theoretical Domains Framework (TDF), and the FASI (Feasibility, Affordability, Sustainability, Importance) matrix. This mapping helped identify potential implementation barriers and facilitators. The hybrid evaluation framework design was concurrently designed. Results: The risk of bias assessment and mapping process identified 15 articles (out of 38 potentially eligible), whose relevant components informed a six-module psychoeducation intervention with a core self-efficacy module, supplemented by five optional social prescribing activities. Each component was justified based on its theoretical alignment with carers’ capability/opportunity/motivation, evidence of effectiveness, and feasibility/affordability within existing resources. Priority setting consultation with older community carers, and in-depth interviews with social and health care providers helped refine the intervention components, duration and delivery mode. Discussion: This package of mapping process and outcome evaluation offers a structured approach to designing social frailty strategies and implementing them under real-life circumstances. Next steps: A recruitment strategy to attract beneficiaries across health services and community organisations to test the program effectiveness, scalability and sustainability with interdisciplinary partners.