When you say sovereignty, you are referring to the state that is in charge of making some laws and making sure that the resources are properly controlled. With sovereignty, you do not need other nations anymore to do what you need to do. When you say autonomy, this means self-government. The state will have the ability to act without the need to get support from other countries. When someone is experiencing autonomy, this means that you will always have free will. You do not need to get the approval of other people in order to continue on with what you are doing. You should not be forced to do something anymore.
It can be easy for people to assume that sovereignty and autonomy are the same, but there are some differences between the two. Sovereignty is known to be the type of authority wherein it is considered to be the central authority. This means that its power will depend on is the geopolitical state. Autonomy means that there are certain areas wherein there are different minorities that can be considered to be a part of the greater state. For example, if you would look at China, there are some areas that it considers to be autonomous such as Tibet. Another example of this is Inner Mongolia, that is also considered to be related to China.