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Sure.
awk '/Sis/{close(f);f=sprintf("Sis%02d",++c)}{print > f}' file

Explanation:

/Sis/ | search for the pattern and if it matches:

{close(f) | close the opened file (if there was one...

awk '/Sis/{close(f);f=sprintf("Sis%02d",++c)}{print > f}' file