How do I transition from a career of computer science and electrical engineering to become a sports scientist?

One of the best Biomechanists ever is (was? not sure if he's still alive) David A. Winter (Google him, his textbook on Biomechanics of Human Movement is one of the best in the field).  He was an electrical engineer who started studying anatomy and human movement and applied his knowledge of EE to develop methods to measure and analyze human movement.  There's a ton of data analysis to do with movement data and understanding signals and controls theory (e.g. filters, sampling theory, etc.) can take you a long way.  Take a course in human physiology and one in human anatomy and you're on your way. If you are willing to quit your job for an internship, then you should be able to go to graduate school.  That's what I did.  Grad school can generally be free if you're a good student/candidate: you teach labs and do research for a prof in exchange for tuition and stipend.  I worked as a Mechanical Engineer for 8 years after undergrad, then quit and went to grad school in exercise physiology & biomechanics.  I got two MS degrees at two universities (second one was supposed to be a PhD but family needs required I start making real money again) without incurring any debt in 5 years.  I didn't increase my wealth much in those years; but I wasn't out of pocket, either. Much of the technology to do biomechanics is in two areas: force transducers and 3d motion capture.  The latter has been taken on by Hollywood as it's used for animation & special FX.  But there are opportunities for an engineering job in those industries if you just want to change careers.  Check out Kistler (force transducers) & Vicon (motion capture) to start.  They have tons of competitors, but they are two of the biggest players in each area. Smart prosthetic design is also closely related to sports science, especially biomechanics.  Some of the latest state of the art leg prostheses are really amazing, and required some genius software engineering and robotics knowledge, with the design guidance of physiologists and biomechanists.