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This sentence is from my textbook:

> 私の将来の夢は自分の店を［持つことです／*持ちたいです］。

In other words, it says that 持ちたいです is incorrect in this case.

But since the topic is 私の将来の夢、持ちたい seems like a perfectly suitable response.
Why isn't it?

Is the second sentence maybe saying, "My dream is _to want_ to open my own
store"?
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grammar
夢は〜を持つことです　VS　夢は〜を持ちたいです
You are already answering your own question. The translation of the incorrect
answer is: "My dream is to want to open a store"... it simply doesn't make
sense in any language.

It is basically a mix of the following two sentences, that individually mean
similar things:

> 私{わたし}の将来{しょうらい}の夢{ゆめ}は自分{じぶん}の店{みせ}を持{も}つことです。 = My dream is to have my own
> store
>
> 私は自分の店を持ちたいです。 = I want to have my own store
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> 1 : 私の将来の夢は **自分の店を持つこと** です。(correct)  
>  2 : 私の将来の夢は **自分の店を持ちたい** です。(incorrect)  
>  3 : 私の将来の夢は **自分の店を持ちたいということ** です。(correct)

The sentence structure of 1 is "A is B" where A and B are nouns or noun
clauses.  
As you know A is 私の将来の夢 and B is 自分の店を持つこと in 1, but 自分の店を持ちたい in 2 is not a
noun.  
To change 自分の店を持ちたい into a noun clause you should add "ということ" to it as in 3.

##

# EDIT

Thanks to Yuuichi Tam's comment, I'll add useful information to my answer.

If you do not stick to "A is B" which is the sentence structure of 1 and you
want to use the expression in the second half of 2 as it is, you'll get a
grammatically correct sentence like 4.

> 4 : 私は将来、 **自分の店を持ちたい** 。 or 私は将来、 **自分の店を持ちたい** です。

4 sounds much more natural to the native Japanese than 3.

If you want to use 夢 by all means in 4, it'll become like 5.

> 5 : 私は将来の夢として **自分の店を持ちたい** 。 or 私は将来の夢として **自分の店を持ちたい** です。
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