There are many excellent books, journals, websites, and professional organizations through which you can learn more about the field of sport and exercise psychology. Some of them are listed here:
Anderson, M.B. (2000). Doing sport psychology. Champaign, IL: Human Kinetics.
Anderson, M.B. (2005). Sport Psychology In Practice. Champaign, IL: Human Kinetics.
Griffith, C. (1928). Psychology and athletics. New York: C. Scribner's Sons.
Griffith, C. (1928). Psychology of coaching. New York: C. Scribner's Sons.
Le Unes, A. (2009). Sport psychology. Psychology Press.
Tennenbaum, G., & Eklund, R. (2007). Handbook of Sport Psychology (3rd Edition). Hoboken, NJ: Wiley & Sons
Van Raalte, J.L. & Brewer, B.W. (Eds.) (2002). Exploring sport and exercise psychology (2nd edition). Washington D.C.: American Psychological Association.
Weingberg, R. & Gould, D. (2007). Foundations of sport and exercise psychology (4th Ed.). Champaign, IL: Human Kinetics.
Williams, J.M. (Ed.) (2009). Applied sport psychology: Personal growth to peak performance (6th Ed.). Mountain View, CA: Mayfield Publishing Co.
Journal of Applied Sport Psychology
The Sport Psychologist
Journal of Exercise and Sport Psychology
International Journal of Sport and Exercise Psychology
Research Quarterly for Exercise and Sport
Journal of Sport Behavior
Psychology of Sport and Exercise
Medicine and Science in Sport and Exercise
Professional Sport Psychology Organization Websites
American Alliance for Health, Physical Education, Recreation, and Dance (AAHPERD)
American College of Sports Medicine (ACSM)
American Psychological Association (APA) - Division 47 - Sport and Exercise Psychology
Association for Applied Sport Psychology (AASP)
Texas Association of Health, Physical Education, Recreation, and Dance (TAHPERD)
North American Society for Psychology of Sport and Physical Activity (NASPSPA)