In this case study, we investigated how interdisciplinary teacher educators collaborated as a Community of Practice (CoP; n = 3) to support secondary science PSTs (n = 7) learning how to work with multilingual learners’ science ideas using a tri-focal instructional approach in the simulated classroom, TeachLivE™. Data sources included audio/visual recordings of TeachLivE™ sessions and a PST reflection survey. Findings showed the PSTs need continued support to implement the tri-focal approach and received collaborative feedback from the CoP. The PSTs appreciated the authentic context interacting with multilingual learners and the coaching sessions in TeachLivE™. Implications for future research and TeachLivE™ practices are discussed.