Hi Deigo,
This can be accomplished by using either VVR (Veritas Volume Replicator) or 3rd party hardware replication (i.e. EMC Mirrorview, HTC TrueCopy, etc....).
In Summary, you will create what is called a Replicated Data cluster. This means that the nodes will be located in the same cluster, but they will not share storage and a cluster-aware replication solution will be put in place to handle that aspect.
You did not state which version of SFW-HA you have installed, so I will assume the latest version (5.1). I have included a link to a SQL Solutions pdf document which includes detailed steps for configuring SQL 2005 in a Replicated Data Cluster (Section 4 - Replicated Data Clusters).
If you have any specific questions after reading this, please don't hesitate to post them to the Forum, otherwise, it may be best to open a Support Case if you have more than just a few questions or need more indepth knowledge than can be provided in the forum.
exftpp.symantec.com/pub/support/products/Storage_Foundation_for_Windows/306326.pdf
I hope this helps,
rhanley