Brown departs the Steel after three seasons at the helm.
Steel chief executive Sue Clarke said the decision to not renew Brown's contract was a reflection of a new direction for the franchise.
"We need to have succession plans in place to ensure our franchise continues to thrive and that includes identifying opportunities for players to step up to the plate," she said.
"Jodi has been an integral member of our team who has made a significant contribution over the last three years. In sport, tough decisions must be made - and this was a difficult one.
"After reviewing our strategic goals moving forward, we have identified the need to look further than just the next season. For us, that means investing in players who we believe will excel given the chance to take our franchise into the future.
Brown said she was disappointed not to be returning for Steel but respected the franchise's decision.
"I still believe I have an incredible amount to offer netball but sometimes what you have to offer simply doesn't fit with the planned direction of the team, and that's just a reality of professional sport," she said.
Brown said she would take time to assess her options before making a decision on where her playing future lies.
