Seat's new range-topping SUV will be called the Tarraco, named after Roman city in northwest Spain, now known as Tarragona.
The seven-seat crossover, due to be launched at the end of the year, will be the third model in Seat's popular SUV lineup after the subcompact Arona and the compact Ateca.
The Nissan X-Trail rival will likely share a good deal of technology with another seven-seat model from Volkswagen Group, the Skoda Kodiaq, reports say.
Seat has benefited from a surge in demand for SUVs, with sales of the Ateca, the brand's first crossover, helping it return to profit in 2016 following 11 years of consecutive losses.
CEO Luca de Meo has said he expects the arrival of the new SUV to take the company to the "next level."