Well I'm not sure what you want to know. You posted this in the Gendai forum, so you may already know that there is a modern-day budo form of naginata-do. It is a little like kendo, though the naginata is used primarily.
There are older schools (koryu) that have sojutsu and naginatajutsu, so you may find something by searching in those forums.
I don't think there is any sort of gendai sojutsu, though evidently some of the ninpo groups will study it.
What exactly are you looking for? History, a place to train, or..?
J. Nicolaysen
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"I value the opinion much more of a grand master then I do some English professor, anyways." Well really, who wouldn't?
We're all of us just bozos on the budo bus and there's no point in looking to us for answers regarding all the deep and important issues.--M. Skoss.