Environmental sustainability has often been associated with increased organizational profitability, efficiency, and competitiveness. A related example is green practices which have become a central component of many companies’ marketing strategies and day-to-day management. The current study aims to develop and validate a scale for use in sport organizations and activities. An item bank derived from past literature was prepared, which was then assessed by a group of experts and pilot-tested. Two waves of data collection were then collected (N = 1165 and N = 567). An exploratory factor analysis was performed with the data from wave 1, and a one-dimensional solution was presented. Then, a confirmatory factor analysis followed by a multigroup analysis was performed with the data from wave 2. The results confirmed the six-item one-dimensional scale with high levels of reliability and validity and optimal fit indices. The scale is important to green practices adopted by sport organizations regarding the customer–organization relationship.