This study aimed to design an educational program using the cooperative learning method and investigate its effect on learning some basic basketball skills and modifying environmental attitudes among first-year preparatory school girls. The researcher employed the experimental method using a two-group experimental design (experimental and control groups) with pre- and post-measurements, as it was deemed appropriate for the nature of the study. The research population consisted of first-year preparatory school girls enrolled at the Preparatory School for Girls affiliated with the Kafr Saqr Educational Administration, Ash Sharqiyah Governorate, during the academic year 2024/2025, totaling (238) students. The participants were selected purposively, and a random sample of (36) students was drawn from the population. Ten students were assigned to a pilot study to establish the scientific validity and reliability of the tests and measurements used in the research. Consequently, the main sample consisted of (26) students, who were divided equally into two groups: an experimental group and a control group, with (13) students in each group. The results revealed the following: 1- The proposed educational program using the cooperative learning method contributed positively to improving some basketball skills, including the chest pass, dribbling, lay-up shot, and set shot (free throw), among the students of the experimental group. 2- The proposed educational program using the cooperative learning method contributed positively to modifying environmental attitudes in the dimensions of environmental sports, environmental health, and environmental aesthetics among the students of the experimental group. 3- The control group showed only slight improvement in learning the basic basketball skills and modifying environmental attitudes under investigation. 4- The experimental group that learned through the cooperative learning method outperformed the control group that was taught using the traditional method (explanation and demonstration) in the speed of learning basic basketball skills and in modifying environmental attitudes under investigation.