In 2007, Oxtoby was appointed assistant coach of the
Football West National Training Centre. During 2008, she was appointed
Western Australia women's Under-15 coach. In July 2012, Oxtoby was appointed manager and head coach of English
FA Women's Premier League Northern Division club
Nottingham Forest, a role she combined with playing for Doncaster in the FA WSL. In August 2013, Oxtoby accepted a coaching role with the reserve team of WSL club
Notts County Ladies, before she returned to Australia. After returning home to Australia in 2014 to the club she captained, Oxtoby become the assistant coach for Perth Glory Women. She helped guide the Glory to the Premiers plate winning the league, and their first ever grand final appearance. During this period, she also set up Tanya Oxtoby Football Coaching, her own coaching and mentoring business for female footballers. She also spent 18 months working with the
Australian under 20 team, as an assistant coach and video analyst. Following a successful stint with back in Australia, she then moved back to Notts County Ladies in early 2016 as their Director of Development and first team assistant coach, and become Head of Women's Football and Futsal at the
University of Nottingham. In 2017, Oxtoby was recruited by
Birmingham City Ladies to become an assistant coach with a focus on out of possession with the first team in the Women's Super League. Oxtoby was then recruited at the Talent Identification and Transition Manager for English Colleges Women's National Team, a position she held for two years. She also served as lifestyle advisor for Team GB Goal Ball, a Paralympic sport. In July 2018,
Bristol City Women named Oxtoby its new manager. In her first season with Bristol City, she won two manager of the month awards and took them to a record breaking points tally finishing in 6th place in the Women's Super League, with the most notable results being draws against
Chelsea and
Manchester City. She managed to ensure Bristol's safety in the WSL in the following season, despite having the lowest budget of all the teams competing within the league, as well as a crippling injury list. She is renowned as an exceptional player developer, identifying young English talent and providing them the opportunity to excel within her provided environment and earn game time at the highest level. The likes of
Ebony Salmon,
Poppy Pattinson,
Katie Robinson and
Aimee Palmer are among some of the best young talent to come through under her supervision. In August 2021, she stepped down as manager following her maternity leave, and was succeeded by Lauren Smith. Following a short stint with the
Scotland women's national football team as an assistant coach, Oxtoby joined
Women's Super League club
Chelsea in the same role in September 2021. On 1 September 2023, Oxtoby was officially appointed as the new manager of the
Northern Ireland women's national team, having signed a four-year contract with the
Irish FA. Following a 1–0 win against
Southampton in her first game in charge, she said of the squad "The players want to learn, and they want to get better, and as a coach, that's all you can ask for. They're all asking good questions and wanting to understand what we're going after as a group, so from that perspective, it's very pleasing. That energy has been really good." ==Personal life==