You can share any tracks or playlists from SoundCloud with your circles on Google+. Google+ uses the Visual player, so make sure you’re including high quality artwork for your tracks and playlists. You can also add relevant hashtags to your posts so they’re more discoverable on Google+.
You can share by clicking the 'Share' button underneath the track's waveform and then clicking on the Google+ icon to send it out to your Google+ circles.
Automatically sharing to Google+
If you'd like to automatically share to your Google+ account, you can connect your SoundCloud account to automatically post the tracks you upload. To do this, sign in to your SoundCloud account and go to your Connections Settings page. Click the Google+ button and sign in to your Google+ account when prompted.