Hi @Gowri Shankar ,
Thanks for reaching out and posting your query.
I don't think ADF is the suitable for your requirement as it is not intended for that purpose. It is better to have another custom application job that can update the file permission after ADF copy is completed.
But if you know of a way to update SFTP permissions programmatically, then you may try exploring Azure function activity and Custom Activity in ADF which are intended to transform/process data in a way that isn't supported by Data Factory. The custom activity runs your customized code logic on an Azure Batch pool of virtual machines.
Hope this info helps.
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