She joined SBG in May 2012 as head of operations and was promoted to operations director in November 2012.
Previously she worked in senior roles in compliance and risk management at Lloyds Banking Group and The Consulting Group.
She will replace Shaun O'Leary who had been working as interim chief risk officer since joining the firm in July 2012. Mr O'Leary has now left the firm following the completion of his contract.
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George Higginson, chief executive of SBG, said: "Julie has a key role in implementing our improved systems and controls framework. Julie's wealth of knowledge and experience of the risk and governance disciplines, gained over many years, will help us to ensure that our group's future developments keep pace with the ever changing regulatory environment."
Ms Sadler said: "I am very pleased to be part of SBG's experienced leadership team and I am looking forward to building on the work that is already well underway to embed strong governance and robust risk management frameworks throughout the business.
"We are committed to ensuring that advisers can clearly evidence how their services are delivering the right customer outcomes."

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