Environmental sustainability and climate change have become increasingly important in public debates and politics. This study examines the determinants of sport club members' pro-environmental behavior in Germany. Theoretically, we draw on the theory of planned behavior, ecofeminism, and the luxury good hypothesis to explain the effects of individuals' environmental consciousness, gender, and income on their pro-environmental behavior, respectively. Data collection took place in 2019 and 2020 via a nationwide online survey of active sport club members in five team/racket sports (n = 3038). Regression analyses were estimated to examine the determinants of two indicators of pro-environmental behavior, i.e., the monthly carbon footprint resulting from traveling to training sessions and pro-environmental actions. The results reveal that environmentally consciousness members behave more environmentally friendly, supporting the theory of planned behavior. Women have a significantly higher carbon footprint, but only in the model including the interaction with environmental consciousness, indicating that female gender only works in conjunction with environmental attitudes. Income is associated with a significantly higher carbon footprint for training, while it has no effect on pro-environmental actions related to club sport. The findings have implications for sport managers and policy makers.