The COVID-19 pandemic struck right during the Olympic preparation, leading to significant training restrictions such as noncontact practices for combat sports. This case study research describes the application of a complementary virtual-reality (VR) intervention to train elite boxers preparing for Tokyo 2020 during the pandemic. It also addresses the evaluation of broader visuocognitive functions in elite boxers. Six boxers were allocated to two groups: one experimental group trained on a 360° VR (360VR) temporal video-occlusion program, and one active control group trained on a VR game simulation during 11 sessions. Pre- and postevaluations of specific decision-making performance were performed on a 360VR evaluation test. Fundamental visual and visuocognitive functions were assessed at baseline. Greater on-test decision-making improvements were observed in the 360VR-trained group compared with VR game, and 360VR offered self-reported satisfactory, representative, and safe individual training opportunities for the boxers. More research is warranted to explore the applications of 360VR and VR simulation for psycho-perceptual-motor-skill evaluation and training. Superior visuocognitive performance was observed in elite boxers and should also be a topic of further investigation. The methodological approach, implementation, and reflections are provided in detail to guide practitioners toward the applied use of VR in the sporting environment.