The best way to get people to change is to set examples from the highest levels within the organization. If senior executives say one thing and then do another, people begin to doubt whether the organization is truly committed to the change initiative.
The sponsor sets an example for everyone else. Whether it's in public or private meetings, it is important that the sponsor fully supports and always endeavors to gather support for the initiative. If the sponsor has defined the reasons for change and has agree a consistent message about the need for change, they can then communicate one strong message throughout the organization.
The sponsor can also reward those that are supporting and making the early steps to change their behavior. This sends out a strong message within the organization that old ways of working are no longer appropriate.