Adams posted on social media on Friday night that she has ended her involvement with Cowan, her manager of 14 years, and joined the Halo Sport agency.
"Hey all – just a quick note to let you know that I have made some changes to the structure of my team," Adams posted.
"Nick Cowan and I have agreed to part ways. Nick has decided to pursue other endeavours and I wish him well in those and thank him for all of his work over the years.
"I have made the decision to join the team at Halo Sport and I am looking forward to working with them."
Halo Sport's website states they are a full-service agency, focusing on sponsorship, events, activations, and relationships providing "considered, long lasting, thought provoking connections" for stakeholders and brands.
They have four key areas: sponsorship, events, activation, and rugby relationships.
Adams, the dual Olympic shot put gold medallist and four-time world champion, gave birth to her second child, son, Kepaleli Tava Sydney Adams-Price, in March. She has a daughter, Kimoana Josephine, who was born in October 2017.