Is there any way to modify classpath through pom.xml?

I have a situation like below: 
1. I have a JAR which is available in cloud URL 
2. I want to download the JAR and use it as a JAR in my project. 
3. For downloading I am using Maven ant run plugin and putting it in specific folder of the project.

Now I want to add the jar to classpath file via pom.xml


Is there anyway in which as soon as I download the JAR from cloud, I can modify my classpath by adding a classpathEntry through POM.xml?

I have downloaded the JAR from the cloud and placed it in specific folder.