There is already an existing workflow solution from SAP & Sybase. Below is the link for the same. You can check this out to see if it suits your requirements.
In case, if you want to develop all together a new application even then Sybase offers you some brilliant features to do that. Without even knowing device technology, you can simply develop a work flow appplication in a day provided you have the corresponding functions/BAPI's/RFC's exposed in SAP Backend system. Check out below links for the same :
I think you need to be more specific about the level of mobilization of the BPM Workflows.
In BPM you can define automated tasks as steps in the process, and use them as web services easily. Within your mobile application, calling this web service is also very easy.
The start task of BPM workflows can be used as an example. I have a tiny iPhone application that starts a BPM workflow with parameters.
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