"The Scarlets are known throughout the world and are playing some great rugby at the moment... it was clear to see the ambitions of the club and the environment at the Scarlets is just what I am looking for," Cassiem said in a statement.
The 28-year-old is the Scarlets' third new recruit after the signings of loose forward Blade Thomson and centre Kieron Fonotia.
"He's a dynamic player that likes to carry and has the ability to offload. He is a very physical individual," head coach Wayne Pivac said.
"He has the ability to play across the back row but has been signed primarily as an eight."
Scarlets travel to Munster for their next Pro14 game on Saturday.
(Reporting by Aditi Prakash in Bengaluru; editing by Amlan Chakraborty)
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