Cancer is a global health concern and affects patient quality of life, anxiety, depression, and sleep. Physical exercise shows promise in alleviating these effects. Karate is a holistic intervention that could be used to improve several outcomes related to cancer disease, but to date its effect remains unexplored. This quasi-experimental pre-/poststudy evaluated the effects of a 6-month karate program conducted twice a week for 60 minutes each session on quality of life, anxiety, depression, sleep quality, and psychosomatic symptoms in 22 patients with posttherapy oncology. Significant improvements in quality of life (P = .006), anxiety (P < .001), depression (P < .001), and sleep quality (P = .011) were observed. Multidimensional psychophysical evaluation showed significant reductions in symptoms (P < .05). High participant satisfaction was reported across all dimensions. This pilot study shows the potential benefits in oncology patients, but more research is necessary to confirm these findings.