I think it is correct to say
是不是想离开 to emphasize whether it is true that you want to leave.
I wonder if I want to add
你, where should it be in the sentence?
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[是不是] [想离开] = [do] (subject omitted) [want to leave?]
[是不是你] [想离开?] = [Is it you who] [want to leave?]
[是不是] [你想离开?] = [Is it] [you want to leave?]
[你是不是] [想离开?] = [Do you] [want to leave?]
To add the subject '你' to '是不是想离开', It should be placed before the sentence, 是不是想离开, and 你是不是想离开 would have the same meaning. "是不是你想离开?" could change the meaning of "是不是想离开?"