Norman will be responsible for the UK operations of the company's OMD Digital online division. She will also oversee the integration of its service offering within OMD UK, Manning Gottlieb OMD and OMD International.
The move is part of a new focus on the agency's digital offerings.
Part of OMD's digital shake-up includes Amy Lennox moving to head of OMD Digital in the UK. Lennox was previously head of online for Manning Gottlieb OMD.
She will be joined by Shan Henderson, who previously ran OMD UK's online unit, who now takes the position of deputy head of OMD Digital.
Justin Taylor, formerly associate director at OMD International, has also been promoted to head of OMD Digital for the OMD International London office, and as a further shift in focus to digital for the agency, Jean-Paul Edwards will become head of Digital Futures across the entire company, having previously worked at specialist department The Source at Manning Gottlieb OMD.
Nick Manning, group chief executive at OMD UK, said: "Sheryl has an unrivalled depth and breadth of experience in a range of digital channels, not just online, from a brand owners' perspective.
"One of her key responsibilities is to ensure that we keep our digital service aligned with all of our other services, including: consumer insight via OMD Insight; branded content via OMD Fuse; and effectiveness via OMD Metrics.
"Amy and Shan have created great online teams within their respective agencies, and our online product is already first class, so we're building on a very solid foundation. Justin has done a great job across a range of domestic and international clients within OMD UK, and now he will concentrate on helping an even stronger cross-border offering to our international clients."
OMD Digital said it is the first time it has consolidated the leadership of its divisions across all of operations.
The agency also plans to conduct a wide-ranging research study into the new-media landscape, which will focus on consumer attitudes and behaviour.
Neil Hurman, OMD's strategic development director who will head the study, said: "We know that people's media habits are changing deeply and quickly, thanks to broadband, iPods, PVRs, IPTV, and the plethora of traditional media research is pretty hopeless at keeping up with these changes.
"We're conducting a large-scale research study, which will help us understand and measure these changes."
Manning added: "We are aiming to create something different and unique in the market which will make the old media agency model redundant."
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