There are plenty of nomadic people outside of central asia.
How about the Plains Indians?
The different Amerind groups under this designation lived a nomadic life, following the bison herds. When horses became available it make that easier.
Africa has many groups of nomadic people. The Maasai are nomadic pastoralists and the people and cultural regalia are spectacular. They would be a fine basis for a fictional nomadic people.
If you want to base your people on Europeans you could read up on the Sami people of Finland.
The Sami are a nomadic people, and in the summer months many still
live in their tepee like homes, known as Katas, which can easily be
taken down and reconstructed in a different place as the people move
across the country with their animals.
My understanding is that the reindeer are somewhere between the North American bison (wild) and the African cattle (tame) - semidomesticated.
Any one of these could be a jumping off point for pastoral / semipastoral nomads with lifestyles superficially similar to the nomads of central asia.