Hello Manigandan Arumugam,
Thank you for bringing this question to the forums. I researched this a bit and discovered that it's very likely we can ingest the same source data systems that you are putting into Qlik files. There will be a certain amount of redevelopment that would go into a switch to any new system, so this is a great opportunity to take stock of what is working and what is not. Tableau has many partners and our own professional services team which can be leveraged to help with some of this work if an extra pair of hands would speed this transition. Please reach out to your account manager for additional assistance if needed.
I started working with Qlik and now i'm with Tableau.
I feel it's very unlikely a tool for conversion because Tableau doesn't treat information as Qlik does. Tableau has no code, only SQL.