SecureRandomにはそういうメソッドはないみたい。
こんな感じ？
require 'securerandom'
N = 10
p N.times.map { SecureRandom.random_number(10) }.join # "7260150113"
追記:
コメントより、以下のほうがずっと高速にできるようです。
p format("%0#{n}d", SecureRandom.random_number(10**n))
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