Why not?
You need to get the files somewhere Sonarr can access then, the best way is sshfs, that way Sonarr sees the files and transfers them as they download, alternatively you could sync the files with another tool and use a remote path mapping to tell Sonarr where to import them from (Remote Path Mappings are just a way to tell Sonarr to take the path the download client reports and translate it to a different path where Sonarr can access them).