Not as such, no.

There's quite a bit for you to read on the topic in older threads:

Were the Marian Reforms actually a thing by u/Duncan-m who has a nice list of the things Marius did do, the things Marius kind of did, and the things he didn't. (Spoiler: the things he did do were mostly one-off incidents and not any kind of structural military reforms, and some are to be doubted despite sources stating he did them.)

How were military reforms in Ancient Rome, such as those of the Polybian or Marian reforms, conceived of and planned? by u/XenophonTheAthenian who informs us they were neither conceived of, nor planned, nor implemented.

Also includes a lengthy argument between this and the previous user, though it seems to me they are mostly saying the exact same thing with slightly different stresses.

How big an impact did Gaius Marius have on the eventual downfall of the Roman Empire by u/LegalAction (None)

As always feel free to ask additional questions, and anyone who has further insights is more than welcome to add them.