Sullivan joins Scenic and Emerald from Sani/Ikos Group where she was regional sales manager. She has previously held roles with APT Travel Group, Avalon Waterways and Jet2holidays.
In her new position, Sullivan will build and manage Scenic and Emerald's relationships with agents, and provide support for trade events and visits, as well as training sessions and marketing.
Sullivan, who will report into Scenic Group head of sales Jonathan Davies, said she was looking forward to reconnecting with agents in the Midlands and the north. Her appointment grows Scenic and Emerald's trade team to 12 in total.
Davies added: "Leiza brings a wealth of industry knowledge and a strong track record of working closely with the trade, making her a fantastic addition to the Scenic and Emerald Cruises trade team.
"She will be instrumental in developing and nurturing partnerships with retail and independent agents, while delivering valuable support through training, events and marketing initiatives."