Sociology itself does not necessarily have an impact on health care systems. Sociology is a field of study, not a factor that could have an impact on health care systems.
That said, health care systems are impacted by some things that sociology studies. For example, health care systems can have a hard time getting health care to rural areas or to impoverished urban areas. The places where people live and their economic statuses are topics that are of interest to sociology.
Since so many sociological factors have an impact on health care systems, sociology as a discipline can impact those systems. Health care systems might, for example, commission sociologists to study their systems and help them provide better care to more people.