If you want to manage /opt/android-sdk by yourself or via SDK Manager, you can install the android-sdk dummy packages which only provide the needed dependencies.
sudo pacman -S android-sdk-dummy android-sdk-platform-tools-dummy android-sdk-build-tools-dummy
It will ask you to replace android-sdk, android-sdk-platform-tools and android-sdk-build-tools. Simply answer with "Y".
After that you can install android-sdk from http://developer.android.com/sdk/index.html to /opt/android-sdk and run the SDK Manager.
Note: You'll loose the ability to update android-sdk via pacman and bbqlinux repos. You always have to do it via SDK Manager.
If you want to switch back to the bbqlinux packages simply run:
sudo pacman -S android-sdk android-sdk-platform-tools android-sdk-build-tools